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The third and fourth digits in bearing numbers are of great significance as they typically represent the the inner diameter (ID) of the bearing in millimeters. They provide crucial information about the bearing's fit with the shaft it will be mounted on.

Next, let's study How to Read & Identify Bearing Number and we will present a more unified perspective on bearing codes, conforming to the widely accepted industry standards.

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The second digit in bearing numbers typically signifies the bearing series. It reflects the robustness of the bearing, with certain numbers indicating light, medium, or heavy series. Consequently, this digit provides valuable insight into the bearing's ability to handle different load conditions.

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Bearing numbers serve a valuable purpose in the classification of bearings. They provide at-a-glance information about typical usage, durability, and suitability for specific applications. Regardless of the make, if you have a grasp of the standard bearing number meaning, you can accurately identify the bearing you need.

Besides seals or shields, there are other suffixes, such as cage design, materials, heat treatment, accuracy, clearance, preload, quiet running, stabilization, lubrication, as well as other special specifications.

Leverage Resources: Use manufacturer guides and online tools for bearing identification. Understand Structure: Comprehend the significance of prefixes, the Basic Designation, and suffixes. Avoid Assumptions: Verify bearing numbers across manufacturers - don't assume they're identical. Check Errors: Be mindful of typos, as they can alter bearing specifications. Ask When Uncertain: Consult with experts if unsure about a bearing number.

It's crucial to note that bearing model designations aren't universally standardized and can vary by brand. For ease of reference and comparison, we have developed a special Bearing Cross Reference.

The initial digit in bearing numbers carries substantial significance as it often denotes the type of a bearing. It is instrumental in identifying the bearing's core design.

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Suffixes, signify different designs or variants that deviate from the original or current basic design. For instance, Shielded and Sealed Bearings have different suffixes.

For some bearings, they are exclusively identified with numeric codes, devoid of any prefix or suffix, such as the bearing “6206”.

For numbers over '03', the bore size is calculated as 5 times the value represented by the 3rd and 4th digits in the bearing number.

Prefixes primarily indicate specific components of a bearing and can also identify various bearing variants. Let's take the NTN prefix as an example.